Our current homework policy—for homework questions that demonstrate effort and are not simply copypasta of the exercise—is to leave hints in comments, not in answers. This means that we can't mark duplicate homework questions as such, because a question can be closed as a duplicate of another question only if the other question has answers.
Should we update the policy to put hints in answers, or continue to put hints only in comments?
This is only about homework questions that already meet the requirement of showing effort and asking for help with that effort; obviously copypasta of the exercise remains closeworthy without answer or comment.